The guy says I can't put more memory in because it's maxed out - I thought you could?

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the S10 comes with 512MB soldered to the mobo and 1 ram slot.
so if the specs says, 1GB ram total,... it has 512MB soldered, and a 512MB stick installed.
so yes, the guy is somewhat right that it is at its max since there are no more ram slots available.

what he didn't mention is that you can replace the 512MB stick to a higher capacity one (1GB or 2GB stick).